2004r question
Thread Starter
Racer
Joined: May 2004
Posts: 294
Likes: 0
From: Jacksonville FL
2004r question
I just had a 2004r installed on my 80 vette. But now there seems to be a discrepency in the speedo. It seems to be about 15 off now. I know I'm going down the interstate about 75, but the speedo is only reading about 60. Has anyone else had this problem?
Thanks!
Thanks!
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
When the trans. is changed it's typical to need speedo gears.
The driven gear is at end of speedo cable in trans. as usual. The drive gear can be changed by dropping the pan & pulling the governer since it's on the governer.
Oliver
Are you sure a strip car needs a speedo?
The driven gear is at end of speedo cable in trans. as usual. The drive gear can be changed by dropping the pan & pulling the governer since it's on the governer.
Oliver
Are you sure a strip car needs a speedo?
Burning Brakes
Joined: Sep 2004
Posts: 1,167
Likes: 2
From: Ft.Worth Texas
Is it legal to go 75 in Florida?
Call your local Chevy parts dealer and tell them your tire size, rear end ratio and 200r4 and they can tell you which gear set you need. They might can tell you what is in there now so you don't have to buy both gears. It is easy to change the drive gear.....not so quick to change the gov. gear.
Call your local Chevy parts dealer and tell them your tire size, rear end ratio and 200r4 and they can tell you which gear set you need. They might can tell you what is in there now so you don't have to buy both gears. It is easy to change the drive gear.....not so quick to change the gov. gear.
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Originally Posted by Ganey
Oliver
Are you sure a strip car needs a speedo?
Are you sure a strip car needs a speedo?
Advanced
Joined: Jan 2005
Posts: 81
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From: Tucson Arizona
Safety Car
Joined: Dec 2004
Posts: 4,071
Likes: 0
From: San Diego CA
Originally Posted by Fireslayer26
Thanks for the help guys. Can someone tell me what the stock rear end ratio for a 1980 vette is?
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Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Racer
Joined: Oct 2004
Posts: 439
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From: Mukilteo Washington
Originally Posted by Ganey
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
AS I recall, the count is 1000 revs per mile, for some reason that is an industry standard, only reason I can figger is something mechanical due to the magnetics of operation with that spinning magnet and steady readings on the indicator....it may be something really stilly like 1001 revs/mile....but that is a vague recollection,.....
GENE
GENE
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
Originally Posted by Fireslayer26
What rear end gears would go good with my 2004r and 350 L82 engine? Also how hard is it to change out the rear end gears?
Thanks
Thanks
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
I have the correct gear in mine. BTO asked what my diff was and tire size when I ordered the tranny.
I never use the speedo at the track. When I used to drive it on the street, the speedo bounced around so much at certain speeds, it was worthless. I just make sure I'm not passing people TOO fast.
Fortunately down here in FL, if you're not doing 85 on I75, the little old ladies in mini-vans will run you off the road!
I never use the speedo at the track. When I used to drive it on the street, the speedo bounced around so much at certain speeds, it was worthless. I just make sure I'm not passing people TOO fast.
Fortunately down here in FL, if you're not doing 85 on I75, the little old ladies in mini-vans will run you off the road!
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
Originally Posted by Fireslayer26
What rear end gears would go good with my 2004r and 350 L82 engine? Also how hard is it to change out the rear end gears?
Thanks
Thanks
If you're looking for MPG, the 3.36's are ok. If you want some decent acceleration, go with 3.70's or higher. That OD will still be nice to cruise with.
Team Owner
Joined: Sep 2003
Posts: 88,393
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From: eville in
Originally Posted by marshrat99
My 79 has a 355 rear and a Bowtie tranny that has an OD with something like a .62:1 ratio. It feels like it lugs at anything below 55 MPH. Therefore I suggest a rear of at least 355 or 411.